NEET Biology Multiple Choice Questions – Respiration In Plants

Respiration In Plants Multiple Choice Questions And Answer

Question 1. RQ of fats and proteins is generally

1. 1
2. Less than 1
3. Greater than 1
4. Zero

Answer: 2. Less than 1

Question 2. The value of RQ, when the respiratory substance is poor in oxygen, is

1. Zero
2. Infinity
3. Greater than 1
4. Less than 1

Answer: 4. Less than 1

Question 3. The term protoplasmic respiration is used for the respiration of

1. Fats
2. Proteins
3. Carbohydrates
4. Organic acids

Answer: 3. Carbohydrates

Question 4. Common pathways of aerobic and anaerobic respiration is

1. PPP
2. Glycolysis
3. TCA cycle
4. ETS

Answer: 2. Glycolysis

Question 5. Anaerobic respiration in the presence of microorganisms is known as

1. Pasteurization
2. Decay
3. Fermentation
4. Putrefaction

Answer: 3. Fermentation

Question 6. The term anaerobic respiration was coined by

1. Kostylchev
2. Henry Beevers
3. Dickens
4. Cmickshank

Answer: 1. Kostylchev

Question 7. In anaerobic glycolysis, a net gain of ATP is

1. 2 ATP
2. 6 ATP
3. 8 ATP
4. 1 ATP

Answer: 1. 2 ATP

Question 8. Which is not a product of fermentation?

1. CO₂
2. H₂O
3. ATP
4. Alcohol

Answer: 2. H₂O

Question 9. The site of EMP in eukaryotes is

1. Inner mitochondrial membrane
2. Cytoplasm
3. Mitochondrial matrix
4. Both 2 and 3

Answer: 2. Cytoplasm

Question 10. The pacemaker enzyme of glycolysis is

1. Hexokiimse
2. Hnolnsc
3. Phosphofructokinase
4. Pyruvate kinase

Answer: 3. Phosphofructokinase

Question 11. The number of NADH molecules produced in EMP is

1. 1
2. 2
3. 3
4. 4

Answer: 2. 2

Question 12. BTS in Baeleria Lakes place at

1. Cell wall
2. Plasma membrane
3. Nucleus
4. Cytoplasm

Answer: 2. Plasma membrane

Question 13. The path of glucose breakdown to pyruvic acid was discovered by

1. Embden, Meyerhof, and Parnas
2. Warburg and Dickon
3. Sir Hans Kreb
4. Calvin

Answer: 1. Embden, Meyerhof, and Parnas

Question 14. ATPs generated by 1 NADH₂ and 1 FADH₂ are, respectively,

1. 3,2
2. 2,3
3. 3. 5
4. 5, 3

Answer: 1. 3,2

Question 15. The connecting link between glycolysis and the TCA cycle is

1. Acetyl CoA
2. OAK
3. Pyruvic acid
4. Citric acid

Answer: 1. Acetyl CoA

Question 16. The primary acceptor of the TCA cycle is

1. OAA
2. Acetyl CoA
3. Citric acid
4. Pyruvic acid

Answer: 1. OAA

Question 17. In the TCA cycle, how many reduced co-enzymes are produced from one acetyl CoA?

1. 3 NADH₂, 1 FADH₂
2. 2 NADH₂, 1 FADH₂
3. 4 NADH₂, 2 FADH₂
4. 5 NADH₂, 1 FADH₂

Answer: 1. 3 NADH₂, 1 FADH₂

Question 18. The first 5-C acid in the TCA cycle is

1. Citric acid
2. Succinyl CoA
3. a-ketoglutaric acid
4. Fumaric acid

Answer: 3. a-ketoglutaric acid

Question 19. The number of total ATP generated in the TCA cycle per acetyl CoA molecule is

1. 10
2. 12
3. 14
4. 24

Answer: 2. 12

Question 20. One molecule of FADH₂ upon oxidative phosphorylation yields

1. 2 ATP
2. 3 ATP
3. 4 ATP
4. 5 ATP

Answer: 1. 2 ATP

Question 21. The element required for the activation of the aconitase enzyme is.

1. Fe²⁺
2. Mn²⁺
3. Mg²⁺
4. All of these

Answer: 1. Fe²⁺

Question 22. A characteristic feature of the ripening of some fruits (such as bananas) is a sudden increase in respiration, which is known as

1. Climactic
2. Photorespiration
3. Anthesis
4. Climacteric

Answer: 4. Climacteric

Question 23. Substrate phosphorylation in TCA occurs when

1. Succinic acid changes to fumaric acid
2. Fumaric acid changes to malic acid
3. Succinyl CoA changes to succinic acid
4. Oxalosuccinic acid changes to ketoglutaric acid

Answer: 3. Succinyl CoA changes to succinic acid

Question 24. The mineral activator needed for the enzyme isocitrate dehydrogenase of the TCA cycle is

1. Fe
2. Mg
3. Mn
4. Cu

Answer: 3. Mn

Question 25. A single turn of the Krebs cycle yields

1. 1 FADH₂, 2 NADH₂, and 1 ATP
2. 2 FADH₂, 2 NADH₂, and 2 ATP
3. 1 FADH₂, 3 NADH₂, and 1 ATP
4. 1 FADH₂, 1 NADH₂, and 1 ATP

Answer: 3. 1 FADH₂, 3 NADH₂, and 1 ATP

Question 26. Fumarase enzyme converts

1. Succinic acid to malic acid
2. Succinic acid to fumaric acid
3. Fumaric acid to malic acid
4. Fumaric acid to citric acid

Answer: 3. Fumaric acid to malic acid

Question 27. ETS (electron transport system) is found in

1. Cytoplasm
2. Mitochondrial matrix
3. Inner mitochondrial membrane
4. Outer mitochondrial membrane

Answer: 3. Inner mitochondrial membrane

Question 28. The number of multiprotein complexes in ETS in mitochondria is

1. 3
2. 4
3. 5
4. 6

Answer: 3. 5

Question 29. The complex concerned with oxidative phosphorylation in the inner mitochondrial membrane is

1. Complex 4
2. Complex 5
3. Complex 3
4. Complex 2

Answer: 2. Complex 5

Question 30. Mobile electron carriers in ETS in the mitochondrial membrane are

1. PQ, PC
2. CoQ, Cyt c
3. PQ, Cyt c
4. PC, CoQ

Answer: 2. CoQ, Cyt c

Question 31. The Proton channel is found in

1. F0 of ATPase
2. F1 of ATPase
3. Cyt c
4. CoQ

Answer: 1. F0 of ATPase

Question 32. In prokaryotic cells, the number of ATPs generated from one glucose molecule is

1. 36
2. 38
3. 34
4. 32

Answer: 2. 38

Question 33. Inhibition of sugar breakdown due to the presence of O₂ under aerobic conditions is called

1. Pasteur effect
2. Warburg effect
3. Gibbs effect
4. Kutusky effect

Answer: 1. Pasteur effect

Question 34. The number of shuttles for transporting extra mitochondrial NADH, into mitochondria is

1. 1
2. 2
3. 3
4. 0

Answer: 2. 2

Question 35. Which acid of the TCA cycle is connecting the link with nitrogen metabolism?

1. Succinic acid
2. Malic acid
3. a-ketoglutaric acid
4. Citric acid

Answer: 3. a-ketoglutaric acid

Question 36. According to the chemiosmotic mechanism for ATP synthesis given by P. Mitchell, the force/factor responsible for ATP synthesis is

1. Membrane potential across the membrane
2. Proton motive force
3. Electron motive force
4. Redox potential

Answer: 2. Proton motive force

Question 37. The intermediate common to fatty acid and carbohydrate oxidation is

1. Pyruvate
2. Acetyl CoA
3. Oxaloacetate
4. Succinate

Answer: 2. Acetyl CoA

Question 38. From the oxidation of one molecule of palmitic acid (fatty acid), the number of ATP molecules gained are

1. 131
2. 129
3. 38
4. 142

Answer: 2. 129

Question 39. β-oxidation occurs in

1. Pea seeds
2. Gram seeds
3. Wheat grains
4. Cotton seeds

Answer: 4. Cotton seeds

Question 40. The number of dehydrogenations in pentose phosphate pathways is

1. 2
2. 1
3. 3
4. 4

Answer: 1. 2

Question 41. The  ATP cycle was given by

1. Karl Lohman
2. Warburg and Lipman
3. Peter Mitchel
4. Fritz Lipman

Answer: 4. Fritz Lipman

Question 42. In cyanide-resistant respiration, the electrons are passed from ubiquinone to

1. Cyt b
2. Fe-S protein
3. Flavoprotein
4. FMN protein

Answer: 3. Flavoprotein

Question 43. In PPP, the net gain of ATP molecules for one glucose molecule is

1. 34 ATPs
2. 35 ATPs
3. 36 ATPs
4. 38 ATPs

Answer: 2. 35 ATPs

Question 44. A shunt to EMP or a safety valve is called

1. Pentose phosphate pathways
2. Cyanide resistance pathways
3. ED pathway
4. ETS

Answer: 1. Pentose phosphate pathways

Question 45. Which is not an important intermediate of PPP (HMS)?

1. NADPH₂,
2. Erythrose 4phosphate
3. Ribulose
4. Aromatic compounds

Answer: 4. Aromatic compounds

Question 46. The first step of ethyl alcohol fermentation requires

1. Dehydrogenation
2. Decarboxylation
3. FMN
4. Zn²⁺

Answer: 2. Decarboxylation

Question 47. Hexose monophosphate shunt is

1. The pentose phosphate pathway is a set of reactions that bypasses the glycolysis and Krebs cycle routes for glucose oxidation in the cell.
2. Conversion of glucose into pyruvic acid.
3. The sum of all chemical transformations.
4. A process by which starch is synthesized.

Answer: 1. Pentose phosphate pathway or a set of reactions that bypasses the glycolysis and Krebs cycle routes for glucose oxidation in the cell.

Question 48. The efficiency of respiration is approximately

1. 45%
2. 50%
3. 90%
4. 30%

Answer: 1. 45%

Question 49. Cytochromes are

1. Simple proteins
2. S-containing proteins
3. Conjugated proteins
4. Cu-containing proteins

Answer: 3. Conjugated proteins

Question 50. The most appropriate reason for storing green-colored apples at low temperatures is

1. The rate of photosynthesis is reduced.
2. Respiration and photosynthesis are completely inhibited.
3. The rate of respiration is reduced.
4. The rate of photosynthesis and respiration are reduced.

Answer: 3. The rate of respiration is reduced.

Question 51. The Respiratory Quotient (RQ) is defined as

1. Volume of O₂/Vblume of CO₂
2. Volume of CO₂/Volume of O₂
3. Volume of O₂/Volume of N₂
4. Volume of N₂/Volume of CO₂

Answer: 2. Volume of CO₂ /Volume of O₂

Question 52. Pyruvic acid is formed during

1. Krebs cycle
2. Glycolysis
3. Ornithine cycle
4. Calvin cycle

Answer: 2. Glycolysis

Question 53. The correct sequence of electron acceptor in ATP synthesis is

1. cyt, a, a₃ b, c
2. cyt b, c, a, a₃
3. cyt b, c₃, a, a₃
4. cyt c, b, a, a₃

Answer: 2. cyt b, c, a, a₃

Question 54. Which one of the following contains copper besides iron?

1. Cytochrome-f
2. Cytochrome oxidase
3. Platoquinone
4. Cytochrome-C₁

Answer: 2. Cytochrome oxidase

Question 55. Where does the formation of acetyl CoA from pyruvic acid take place?

1. Mitochondria
2. Chloroplast
3. Cytoplasm
4. Golgi body

Answer: 1. Mitochondria

Question 56. The number of ATP molecules produced by the electron  transport system from Krebs cycle intermediates in a single turn is

1. H
2. 14
3. 12
4. 16

Answer: 1. H

Question 57. In anaerobic respiration, the number of ATP molecules  produced are

1. 1
2. 2
3. 3
4. 8

Answer: 2. 2

Question 58. In which of the following steps of the Krebs cycle, CO₂ is evolved?

1. Isocitric acid → Oxalosuccinic acid
2. Oxalosuccinic acid → α-ketoglutaric acid
3. Succinic acid → Fumaric acid
4. Malic acid → Oxaloacetic acid

Answer: 2. Oxalosuccinic acid → α-ketoglutaric acid

Question 59. Which of the following enzymes is not used in the Krebs  cycle?

1. Aconitase
2. Decarboxylase
3. Aldolase
4. Fumarase

Answer: 3.  Aldolase

Question 60. The end product of fermentation is

1. O₂,
2. N₂O
3. H₂O
4. C₂H₅OH

Answer: 4. C₂H₅OH

Question 61. Gluconeogenesis is the

1. Formation of glucose from other than carbohydrate
2. Formation of glycogen
3. Breakdown of glucose
4. Formation of ammonia from glucose

Answer: 1. Formation of glucose from other than carbohydrate

Question 62. β-oxidation takes place in

1. Matrix of mitochondria
2. Cell cytoplasm
3. Inter mitochondrial chamber
4. Ribosomes

Answer: 3. Intermitochondrial chamber

Question 63. In the TCA cycle, the conversion of succinyl CoA to succinic  acid requires

1. Acetyl CoA+GTP + iP
2. Acetyl CoA + GDP + IP
3. CoA+GTP + iP
4. GDP + iP

Answer: 4. GDP + iP

Question 64. Yeast is used in the formation of

1. Ammonia
2. Alcohol
3. Curd
4. Petrol

Answer: 2. Alcohol

Question 65. The equation represents fermentation

Answer: 2. C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂

Question 66. Which of the following is formed during respiration?

1. O₂ (oxygen)
2. CO₂ (carbon dioxide)
3. NO₂ (nitrogen dioxide)
4. SO₂ (sulfur dioxide)

Answer: 2. CO₂ (carbon dioxide)

Question 67. The pyruvic acid formed in glycolysis is oxidized to CO₂ and H₂O in a cycle called

1. Calvin cycle
2. Hill reaction
3. Starch
4. Vitamins

Answer: 3. Starch

Question 68. The end product of glycolysis is

1. Glucose
2. Fructose
3. Pyruvic acid
4. Ethyl alcohol

Answer: 3. Pyruvic acid

Question 69. R.Q. is more than 1 in case of

1. Fat
2. Fructose
3. Glucose
4. Organic acid

Answer: 4. Organic acid

Question 70. The total yield in one Krebs cycle is

1. 3 FADH_2, 2 NADH₂ 1 ATP
2. 2 FADH₂, 2 NADH₂, 2 ATP
3. 2 NADH₂, 1 FADH₂ 2ATP
4. 3 NADH_2, 1 FADH₂, 1 ATP

Answer: 4. 3 NADH₂, 1 FADH₂, 1 ATP

Question 71. How much ATP will be produced during the production of 1 molecule of acetyl CoA from 1 molecule of pyruvic acid?

1. 3 ATP
2. 5 ATP
3. 8 ATP
4. 38 ATP

Answer: 1. 3 ATP

Question 72. The sequence of cytochromes is

1. Cyt a, b, c, a₃
2. Cyt b, c, a, a₃
3. Cyt b, a, a₃, c
4. Cyt b, c, a₃, a

Answer: 2. Cyt b, c, a, a₃

Question 73. Cytochrome is a

1. Mg pyrrole ring
2. Fe porphyrin ring
3. Nucleotide
4. Alloy of nichrome

Answer: 2. Fe porphyrin ring

Question 74. Krebs cycle takes place in

1. Mitochondrial matrix
2. Cytoplasm
3. Lysosome
4. Nucleus

Answer: 1. Mitochondrial matrix

Question 75. Cellular respiration occurs in

1. Chloroplast
2. Golgi bodies
3. Mitochondria
4. Nucleus

Answer: 3. Mitochondria

Question 76. Maximum amount of energy/ATP is liberated on the oxidation of

1. Fats
2. Proteins

Answer: 1. Fats

Question 77. More CO₂ is evolved than the volume of oxygen consumed when the respiratory substrate is

1. Fat
2. Sucrose
3. Glucose
4. Organic acid

Answer: 4. Organic acid

Question 78. Krebs cycle begins with the reaction [Jharkhand 2004]

1. Citric acid + Acetyl CoA
2. Oxaloacetic acid + Pyruvic acid
3. Oxaloacetic acid + Citric acid
4. Oxaloacetate + Acetyl CoA

Answer: 4. Oxaloacetate + Acetyl CoA

Question 79. Hydrolysis of fat yields

1. Fatty acids
2. Fatty acids and glycerol
3. Mannose and glycerol
4. Maltose and fatty acid

Answer: 2. Fatty acids and glycerol

Question 80. Respiratory quotient of which diet is less than unity?

1. Carbohydrate
2. Fats
3. Organic acid
4. Sugar

Answer: 2. Fats

Question 81. The richest energy compound is

1. Creatinine phosphate
2. protein
3. Carbohydrate
4. Fat

Answer: 4. Fat

Question 82. The stage up to which glycolysis and fermentation are common is

1. Dihydroxyacetone
2. 3-Phosphoglyceraldehyde
3. Pyruvate
4. Glucose-6-phosphate

Answer: 3. Pyruvate

Question 83. The respiratory quotient of carbohydrate is

1. Unity
2. Greater than unity
3. Less than unity
4. Equal to five

Answer: 1. Less than unity

Question 84. During the conversion of pyruvic acid into acetyl CoA,  pyruvic acid is

1. Oxidized
2. Reduced
3. Isomerized
4. Condensed

Answer: 1. Oxidized

Question 85. In the Krebs cycle,

1. ADP is converted into CO₂
2. Pyruvic acid is converted into CO₂ and H₂O
3. Glucose is converted into CO₂
4. Pyruvic acid is converted into ATP

Answer: 2. Pyruvic acid is converted into CO₂ and H₂O

Question 86. Incomplete breakdown of sugar in anaerobic respiration forms

1. Glucose and CO₂
2. Alcohol and CO₂
3. Water and CO₂
4. Fructose and water

Answer: 2. Alcohol and CO₂

Question 87. The significance of the Krebs cycle is the

1. Synthesis of ATP
2. Synthesis of amino acid
3. Synthesis of chlorophyll
4. All of the above

Answer: 4. All of the above

Question 88. In plants, respiration takes place

1. During day only
2. During night only
3. All 24 hours
4. At dusk

Answer: 3. All 24-hours

Question 89. Glycolysis takes place in

1. Cytoplasm
2. Nucleus
3. Plastid
4. Mitochondria

Answer: 1. Cytoplasm

Question 90. In respiration, the largest amount of energy is produced in

1. Anaerobic respiration
2. Krebs cycle
3. Glycolysis
4. None of the above

Answer: 2. Krebs cycle

Question 91. Which of the following is not an intermediate in the Krebs  cycle?

1. Acetic acid
2. Succinyl coenzyme-A
3. Malic acid
4. Citric acid

Answer: 1. Acetic acid

Question 92. The pyruvic acid is formed during

1. Krebs cycle
2. Glycolysis
3. Ornithine cycle
4. Photophosphorylation

Answer: 2. Glycolysis

Question 93. The number of ATP molecules gained during aerobic respiration of 1 mole of glucose is

1. 12
2. 18
3. 30
4. 38

Answer: 4. 38

Question 94. Alcoholic fermentation takes place in the presence of

1. Maltase
2. Zymase
3. Amylase
4. Invertase

Answer: 2. Zymase

Question 95. The site of the EMP pathway in the cell is

1. Peroxisome
2. Cytoplasm
3. Matrix of mitochondria
4. The inner membrane of mitochondria

Answer: 2. Cytoplasm

Question 96. The steps of respiration are controlled by

1. Substrates
2. Enzymes
3. Hormone
4. Bile juice

Answer: 2. Enzymes

Question 97. Enzymes of the electron transport system are present in

1. Inner mitochondrial membrane
2. Matrix
3. Intermembranous space
4. Endoplasmic reticulum

Answer: 1. Inner mitochondrial membrane

Question 98. Which of the following connects glycolysis to Krebs cycle?

1. Acetyl Co A
2. Ribozyme
3. Cytochrome oxidase
4. N-acetyl glucosamine

Answer: 1. Acetyl Co A

Question 99. Pyruvic acid is the end product of

1. Krebs cycle
2. Electron transport system
3. Photosynthesis
4. Glycolysis

Answer: 4. Glycolysis

Question 100. Which of the following accepts terminal electrons during aerobic respiration?

1. Molecular O₂
2. Molecular H₂
3. Molecular CO₂
4. NADPH₂

Answer: 1. Molecular O₂

Question 101. Glycolysis occurs in

1. Cytoplasm
2. Nucleus
3. Mitochondria
4. Both 1 and 3

Answer: 1. Cytoplasm

Question 102. Which one of the following is the first step of glycolysis?

1. Breakdown of glucose
2. Phosphorylation of glucose
3. Conversion of glucose into fructose
4. Dehydrogenation of glucose

Answer: 2. Phosphorylation of glucose

Question 103. How many ATP molecules are released when 1 molecule of glucose is oxidized in our liver cells?

1. 36
2. 38
3. 2
4. 8

Answer: 2. 38

Question 104. The sequence of food materials consumed during starvation is

1. Carbohydrates→ Fats → Proteins
2. Carbohydrates → Proteins → Fats
3. Proteins → Fats → Carbohydrates
4. Fats → proteins → Carbohydrates

Answer: 1. Carbohydrates → Fats → Proteins

Question 105. How many ATPs are produced during the glycolysis of one molecule of glucose?

1. 4
2. 2
3. 36
4. 38

Answer: 2. 2

Question 106. The final electron acceptor in ETS is

1. NAD
2. FAD
3. Oxygen
4. Hydrogen

Answer: 3. Oxygen

Question 107. The respiratory cycle where NADH₂ is produced is

1. Calvin cycle
2. Krebs cycle
3. EMP pathway
4. HMP shunt

Answer: 2. Krebs cycle

Question 108. Most of the enzymes that participate in the Krebs cycle are found in

1. Matrix of mitochondria
2. The inner membrane of mitochondria
3. The outer membrane of mitochondria
4. Stroma of chloroplast

Answer: 1. Matrix of mitochondria

Question 109. The connecting link between glycolysis and the Krebs cycle is

1. Acetyl CoA
2. CoQ
3. Coenzyme
4. CoA

Answer: 1. Acetyl CoA

Question 110. The process of oxidative phosphorylation takes place in

1. Mitochondria
2. Chloroplasts
3. Ribosomes
4. Cytoplasm

Answer: 1. Mitochondria

Question 111. Glycolysis is the conversion of

1. Glucose to glycogen
2. Glycogen to glucose
3. Glucose to pyruvic acid
4. Glucose to citric acid

Answer: 3. Glucose to pyruvic acid

Question 112. Anaerobic respiration takes place in

1. Ribosome
2. Nucleus
3. Cytoplasm
4. Vacuole

Answer: 3. Cytoplasm

Question 113. Which of the following is the product of glucose fermentation by yeast?

1. C₆H₁₂O₆
2. C₂H₅OH
3. (C₆H₁₀O₅)_n
4. CH₂OH

Answer: 2. C₂H₅OH

Question 114. Fermentation is an

1. Anaerobic respiration
2. Incomplete oxidation
3. Excretory process
4. None of the above

Answer: 2. Incomplete oxidation

Question 115. Organelles that are regarded as the house of the cell and in which oxidative reactions of the respiratory process take place are known as 

1. Chloroplast
2. Ribosomes
3. Mitochondria
4. Endoplasmic reticulum

Answer: 3. Mitochondria

Question 116. In which of the following, respiration in the absence of oxygen also takes place?

1. Man
2. Potato
3. Yeast
4. Spirogyra

Answer: 3. Yeast

Question 117.CO₂ is liberated during

1. Ascent of sap
2. Respiration
3. Photosynthesis
4. Transpiration

Answer: 2. Respiration

Question 118. ATP stands for which of the following?

1. Adenine tetraphosphate
2. Adenine triphosphate
3. Adenosine diphosphate
4. Adenosine triphosphate

Answer: 4. Adenosine triphosphate

Question 119. Glycolysis occurs in

1. Vacuoles
2. Nucleolus
3. Mitochondria
4. Cytoplasm

Answer: 4. Cytoplasm

Question 120. The number of ATP produced during the production of 1 molecule of acetyl CoA from 1 molecule of pyruvic acid is

1. 3 ATP
2. 8 ATP
3. 36 ATP
4. 38 ATP

Answer: 1. 3 ATP

Question 121. The energy produced by one ATP molecule is

1. 7.6 kcal
2. 12kcal
3. 20 kcal
4. 100 kcal

Answer: 1. 7.6 kcal

Question 122. Which of the following shows anaerobic respiration?

1. Earthworms
2. Rabbit
3. Echinoderras
4. Tapeworms

Answer: 4. Tapeworms

Question 123. It is believed that the organisms that first inhabited the earth’s surface were

1. Autotrophs
2. Mixotrophs
3. Chemoautotrophs
4. Heterotrophs

Answer: 3. Chemoautotrophs

Question 124. Pyruvic acid before combining with the oxaloacetic acid of the Krebs cycle becomes

1. Citric acid
2. Acetoacetic acid
3. Cis-aconitic acid
4. Acetyl CoA

Answer: 4. Acetyl CoA

Question 125. Anaerobic respiration takes place in

1. Ribosome
2. Nucleus
3. Cytoplasm
4. Vacuole

Answer: 3. Cytoplasm

Question 126. What is the energy coin of a cell?

1. DNA
2. RNA
3. ATP
4. Minerals

Answer: 3. ATP

Question 127. The process of oxidative phosphorylation takes place in

1. Mitochondria
2. Chloroplasts
3. Ribosomes
4. Cytoplasm

Answer: 1. Mitochondria

Question 128. RQ of which diet is less than unity?

1. Carbohydrate
2. Fats
3. Organic acid
4. Sugar

Answer: 2. Fats

Question 129. Pyruvic acid is the end product of which process?

1. Krebs cycle
2. Calvin cycle
3. Pentose phosphate pathway
4. Glycolysis

Answer: 4. Glycolysis

Question 130. 1 molecule glucose, 6 molecules of O₂, and 38 ADP combine to form 6H₂O, 6CO₂, and

1. 38 molecules of ATP
2. 28 ATP
3. 38 ADP
4. 28 ADP

Answer: 1. 38 molecules of ATP

Question 131. The number of ATP obtained at the end of the Krebs cycle

1. 2 ATP
2. 4 ATP
3. 8 ATP
4. 38 ATP

Answer: 4. 8 ATP

Question 132. During the formation of bread, it becomes porous due to  the release of CO₂ by the action of

1. Yeast
2. Bacterial
3. Virus
4. Protozoans

Answer: 1. Yeast

Question 133. How many ATP molecules are produced by the aerobic oxidation of one molecule of glucose?

1. 2
2. 4
3. 38
4. 34

Answer: 3. 38

Question 134. In which one of the following do the two names refer to the same thing?

1. Krebs cycle and Calvin cycle
2. Tricarboxylic acid cycle and citric acid cycle
3. Citric acid cycle and Calvin cycle
4. Tricarboxylic acid cycle and urea cycle

Answer: 2. Tricarboxylic acid cycle and citric acid cycle

Question 135. In alcohol fermentation,

1. Triosephosphate is the electron donor, while acetaldehyde is the electron acceptor.
2. Triosephosphate is the electron donor, while pyruvic acid is the electron acceptor.
3. There is no electron donor.
4. Oxygen is the electron acceptor.

Answer: 1. Triosephosphate is the electron donor, while acetaldehyde is the electron acceptor.

Question 136. In glycolysis, during oxidation, electrons are removed by

1. Molecular oxygen
2. ATP
3. Glyceraldehyde
4. NAD+

Answer: 4. NAD+

Question 137. Aerobic respiration is how many times more useful than anaerobic respiration

1. 2
2. 8
3. 9
4. 38

Answer: 3. 9

Question 138. For the retting of jute, the fermenting microbe used is

1. Helicobacter pylori
2. Methanophilic bacteria
3. Streptococcus lactic
4. Butyric acid bacteria

Answer: 4. Butyric acid bacteria

Question 139. During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

1. Conversion of pyruvic acid to acetyl CoA
2. Electron transport chain
3. Glycolysis
4. Krebs cycle

Answer: 2. Electron transport chain

Question 140. The deficiencies of micronutrients affect not only the growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect the most, both photosynthetic and mitochondrial electron transport?

1. Cu, Mn Fe
2. Co, Ni, Mo
3. Mn Co, Ca
4. Ca, K, Na

Answer: 1. Cu, Mn Fe

Question 141. The chemiosmotic theory of ATP synthesis in the chloro- plast and mitochondria is based on

1. Proton gradient
2. Accumulation of K ions
3. Accumulation of Na ions
4. Membrane potential

Answer: 1. Proton gradient

Question 142. Respiration is which type of process?

1. Catabolic
2. Metabolic
3. Anabolic
4. None

Answer: 1. Catabolic

Question 143. RQ is represented by

1. O₂ /CO₂
2. CO₂ /O₂ ,
3. V₂ /(V₂ -V)
4. O₂ taken in

Answer: 2. CO₂ /O,

Question 144. Which is the site of the Krebs cycle?

1. Chloroplast
2. Golgi body
3. Mitochondria
4. Endoplasmic reticulum

Answer: 3. Mitochondria

Question 145. The curing of tea leaves is brought about by the activity of

1. Viruses
2. Fungi
3. Bacteria
4. Mycorrhiza

Answer: 3. Bacteria

Question 146. Which of the following statements regarding mitochondrial membrane is NOT correct?

1. The inner membrane is highly convoluted forming a series of infolding.
2. The outer membrane resembles a sieve.
3. The outer membrane is permeable to all kinds of molecules.
4. The enzymes of the electron transfer chain are embedded in the outer membrane.

Answer: 4. The enzymes of the electron transfer chain are embedded in the outer membrane.

Question 147. How many ATP molecules could maximally be generated from one molecule of glucose, if the complete oxidation of one mole of glucose to C02 and H20 yields 686 kcal and the useful chemical energy available in the high energy phosphate bond of 1 mole of ATP is 2 kcal?

1. 57
2. 2
3. 30
4. 28

Answer: 1. 57

Question 148. The overall goal of glycolysis, the Krebs cycle, and the electron transport system is the formation of

1. Nucleic acids
2. ATP in small stepwise units
3. ATP in one large oxidation reaction
4. Sugars

Answer: 2. ATP in small stepwise units

Question 149. All enzymes of the TCA cycle are located in the mitochondrial matrix except one which is located in the iimer mitochondrial membrane in eukaryotes and cytosol in prokaryotes. This enzyme is

1. Succinate dehydrogenase
2. Lactate dehydrogenase
3. Isocitrate dehydrogenase
4. Malate dehydrogenase

Answer: 1. Succinate dehydrogenase

Question 150. Which one of the following mammalian cells is not capable of metabolizing glucose to carbon dioxide aerobically?

1. Red blood cells
2. White blood cells
3. Unstriated muscle cells
4. Liver cells

Answer: 1. Red blood cells

Question 151. A competitive inhibitor of succinic dehydrogenase is

1. μ-ketoglutarate
2. Malate
3. Malonate
4. Oxaloacetate

Answer: 3. Malonate

Question 152. The chemiosmotic coupling hypothesis of oxidative  phosphorylation proposes that adenosine triphosphate (ATP) is formed because

1. A proton gradient forms across the inner membrane
2. There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP)
3. Hich-energy bonds are formed in mitochondrial proteins
4. ADP is pumped out of the matrix into the intermembrane space

Answer: 1. A proton gradient forms across the inner membrane

Question 153. The energy-releasing process in which the substrate is oxidized without an external electron acceptor is called

1. Aerobic respiration
2. Glycolysis
3. Fermentation
4. Photorespiration

Answer: 3. Fermentation

Question 154. In germinating seeds, fatty acids are degraded exclusively in the

1. Peroxisomes
2. Mitochondria
3. Proplastids
4. Glyoxysomes

Answer: 4. Glyoxysomes

Question 155. The energy-releasing metabolic process in which the substrate is oxidized without an external electron acceptor is called(Pre)

1. Aerobic respiration
2. Photorespiration
3. Glycolysis
4. Fermentation

Answer: 4. Fermentation